Please note that you can only add an Instructor who is already a User in the LMS, such as a member of the Learning and Development team.
Locate the Event (see here if you're unsure how to do this).
Click on the Add Instructor link from the Toolbox underneath the menu tabs on the left-hand side.
Within the popup window, type the User's name into the box next to Filter.
Click on Search.
Select the radio button next to the User's name within the search results.
You will see that they are added to the left-hand side of the popup window.
If there is more than one Instructor, you can repeat the search and select steps above until all of the Instructors are added.
Click on OK to finalise.